Radioantenna



1933- v. F. EMERSON ET AL RADIOANTENNA Filed Dec. 8, 1931 Patented Oct. 31, 1933 UNITED STTES PATENT OFFICE RADIOANTENNA Victor F. Emersun, Philadelpha, Pa., and William L, Edison, Wilmngton, De].

. 8 Claims.

instances the broadcastmeoflver is dependent upon an antenna system Which must be extended outside of the building housing the receiver. In this way the antenna system is objectiomable because of. its conspicuousnss and unsightfiness. It also follows that the antenna delivers to'the receiver not only the desired impulses but many extrane'ous ones Which cause audible disturb tion of t hrceiverl n t is also characteristic of radio receivrs that their:manualoperationpermits their being con trolledonly by an operator at the receiver itself and this is mahy times awkward when those listening are Within the sound of the receiver but not close enough to operate it by hand.

.It is an object of our invention to provide for ances and in many instances irregular operathe ordinary br0adcast receiver of radiosignals,

prevafling types of telephone instruments for collecting the desired radio impulses.

In the development of our invention it will also be apparent that the devics 'may be incorporated in a standard-talephcne instrument and thus become an auxiliary to the telephone service. s A conspiomous advantage in this improved device is the facility which it affords for the contro1 of the operation of the broadcast receiver by the person using the telephone instrument. There are many times When the one listening to the radio receiver desires to use the telephone but findsthat the operation of the radio receiver is a distraction or annoyance. Under such circumstances the use of thedevice ,puts the operation of the radio receiver under the sole control of the listener who is using the solephone instrument even though this instrument is remote from the radio.reoeiver.

.any .desired mariner.

As illustrating the invention in its essential features and without ,undue limitation to the invention, we have illustrated the preferred forni of the invention inthe following drawing in Which:

Fig. 1 is a side sectional elevatiox1.of the dev1ce; Fig. 2 is a similar view of the device as incorporated in the standard of the conventional telephone instrument;

Fig. 3 is a horizontal section looking upwardly on the line 3, 3 of.Fig. 1 and Fig. 4 is a diagrammatic viewof the electrical circuit involved. 4

.The preferred form .which the invention may cake and as illustrated in the above mentioned drawing, consists essentially in a base which carries a spiral coil. forming the collectdr of radio impulses. h This coil may have its efieet inter1si fied by the preseme of' a inetallic plate which may form one part of an air condenser. In Fig. 1 vve have shown the housing 6 to consist of a molded plastic substance the ,upper edge of which overlies the metallic dis'c 8.

Beneath the met.llic disc 8 is a spiral coil 9 -formed of insulated wire. One end 10 at'the center of the coil 9 is soldered to the center of the disc 8. while the opposite end 11 of the coil is connected to the togg1e switch 12.

The toggle switch 12 bas a lever 13Whch 1535 intended to project beyond the side wall of the base 6.

A lead 14 from the toggle switch 12 connects the latter with a variable resistance or condenser 15 as shown in Fig; 1. An operating knob 16 extends from the resistance.or condenser 15 outwardly 03 the base 6. A second conductor 17 runs from the opposite contact of the switch by way of the movable x1ementof the resistance or condenser 15 out of the base through the opening 18. This conduct0r 17- is intended to be attached to the ground Connection G of the 'usual radio broadcast receiver 19.

Suitable means of Supporting the coil 9 in proximity of the plate 8 may be provided in This may take the place of windings of adhesive tape, transverse supporting struts, or as We have illustrated in Fig.

1 the coil 9 may be held in position by means of cernent or plastic 20. When this form of 1 assembly .is followed the plate8, coil 9, switch 12 and volume contr01 15 are alloast in place in the operation of molding the base 6.

A-second conduct0r 23 attached to the opposite sideof switch 12 passes out of opening 18 and 1 volume control device 15 is connected to the connection A of the receiver.

is attached to the antenna connecticn A of the broadcast receiver.

The device as above illustrated is proportioned to form a foundation for the ordinary telephone receiving instrument indicated broadly as 24. Such an instrument has a base 25 With a felt or fab1ic covering 26 which rests upon the plate 8 as shown in Fig. 1. Since the telephone instrument 24 is electrical1y connected to the telephone lime it serves as one plate of an air condenser of which the other plate is the disc 8. This condenser serves to intensify and strengthen whacever radio energy may be gathered by the telephone line. plate 8 and the associated parts may be said to be Within the direct influence of the radio waves or within the zone of radiant energy.

While the above description applies to the invention as it may be separacely constructed, it is equally true that the invention may form a direct part of the telephone instrument and thus a desiredauxfiary to the telephoneservoe. In Fig. 2 we have illustrated the construction of the invention when so arranged. In this modification the shell 24 of the telephone fits a metallic base 27 Which has a felt or iabrc covering 26. Tne base 27 is bolted at three points 28' to the telephone standard 01 the shell 24 inwell known manner.

'Ihe coil 9 in this instance is laid upon the bottom 27 and has its center point 10 connected to one of the bolts 29 by which the base 27 switch and to the ground connection of the b1oadcast receiver in the manner described. It is evident that both the switch 12 and the Volume control 15 may form integral' parts Ofthe shell 24 or be mounted therein in any suitable way so long as it is possible for the switch lever 13 and the volume control member 16 to be oper ated from outside of the driven standard.

The conductor 23 extending from the switch to the ground connection of the broadcast receiver is also arranged as previously described.

In Fig. 4 there has been shown the electric circuits upon which the invention relies. The base 24 of the telephone is shown to co-operate 'with the plate 8 as an air condenser. The coil 9 of suitable electrical characteflstics is connected primarily to the antenna connecticn A loy-passimg the volume control 15. During normal operation of the broadcast receiver 19 this assembly supplies the colleccing system ordinarily found in antenn but with the advantage of compactness' and freedom from undesi1ed electrical disturbans.

'Ihe switch 12 serves to connect the collectimg system to grOund through the conductor 17 and the connection G on thebroadcast receiverfl Indirectly this serves also to'ground the antenna It follows that on operation of the switch lever 13 the broadcast receiver is put out of operation, for 50 long as the svvitch 12 is in closed circuit with the conductor 17L In the modification shown in Fig. 2 the capacity effect is supplied between the part of the telephone instrument in contact with the connection 10 and other parts of the telephone lime.

With the device assembled as a separate article as shown in Fig, 1 it is put in operation through use as a rest for the telephone trans- In this Way the mitter standard and connecting the wires 17 and 23 to the broadoast receiver. Used as auxiliary to the telephone service the device is assembled Within the transmitter standard as shown in Fig. 2 and the lead wires 17 and 23 form part of the usual telephone cable, being lilewise connected to the broadoast receiver,

The one desirin'g to listen to the radio, operates it in the usual manner andwill find that the antenna system hasmarked advantages in sharpness of tuning, clarity cf tons and freedom from eleetrical disturbans.

If it is desired to use the telephone, which may be at a consideraole distance from the broadcast receiver and connected thereto -by long leads 17 and 23, then the listener need not go to the broadeast receiver to put it out of operation but when using the telephone need only vary the volume control to prevent his own distraction or at the most by means of swtch 12 he may temporary ground the antennacon nection A et the receiver for the short period during which the telephone is being used. At the conclusion of operation ofthe telephone, the switch 12 is thrown to open positionand the radio energy is collected in the coil 9 and again delivered undiminished to the radio rceiver and thus the operation of the latter restoredto normal.

Ihe above forms of the invention have been descrbed for purposes of illustration only and not by way of limitation of the invention other than may be imposed by the appended'claims.

What we claim is:

. 1. In combination, a metallic plate adapted to support the standard of a telephone instrument, et coil haVing one end attached to the plate, a switch attached to the otherend of the coil, a permanent connection betvveen the switch and the input of a radio receiver, and a switch contact to ground.

2. In combination, a metallic plate adapted to support the standard of a telephone instrument, an inductive coil having one end attached to the plate, a switch attached to the other endbf the coil, a permanent connection between the switch and the input of a radio receiver, a variable resistance forming 3. volume control in said connection, a ground and a switch contact thereto.

3. In combination, a telephone instrument having a line connection, a radio receptive coil in capacity relation to said lime connection, a conductor from said coil to the input of a radio receiver, a variable resistance forming a volume control for said conductor, a ground and a sWitch located in proximity to the telephone instrument and coil for grounding the coil and the input of the receiver. v 7

4. In combination, a base, a metal plateassociated therewith, an inductive coil connected to the plate, a conductor normafly connecting the coil to the input of a radio receiver, a ground and a switch in the base for connecting th conductor to the ground.

on the base of the telephone for g1ounding said connections.

7. In combination, a telephone having a line connection, a radio receptive coil within the base With one side of said plate and having one end in contact with said plate, 3, resistance having one end thereof connected to the other end of said wire, an output conductor attached to the same end of said resistance, a switch on the Wire between the coi1 and the resistance, a common ground conductor adapted to be connected to the resistance and to the switch and a base of plastic insulating material in which the plate, the switch and the resistance are held in fixed relation.

. WILLIAM L. EDSON.

VICTOR F. EMERSON. 

